You can lock in your personal computer using a USB Predator. If you lock your computer with a vicious, personal computers, it will work only when the USB is plugged in

If you have a computer by USB, Mouse and Key board can be turned off and the display will automatically get dark. To unlock the computer, you must again plugin the cable USB.

Click this link to install the predator

Method to lock the computer with predator.

First install the predator

Predator will launch automatically after the installation.
Now Plugin  your pen drive to the computer
you will see a message to set new password.
click on OK and set your New password
Then select the correct Drive letter from "USB Key Drive"

After this click on Create Key
Then Click on OK

Note  :   This method will not format your pen drive.

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